Native Copper (in coinage alloy)
Copper (Cu)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Gold Nugget
Native Gold (Au)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Mica (Biotite and Muscovite) in Matrix
Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)
igneous
Granitoid (Granite/Diorite)
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica/Amphiboles)
igneous
Blue Lace Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Diabase
Diabase (also known as Dolerite)
igneous
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Quartz (Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Olivine (Peridotite/Dunite)
Olivine (Mg,Fe)2SiO4 within Peridotite
igneous
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Hematite
Hematite (Fe2O3)
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Chrysocolla on Limonite Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Native Copper
Native Copper (Cu)
mineral
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Orthoclase Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Chrysocolla in Matrix
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Vanadinite
Lead Chlorovanadate - Pb5(VO4)3Cl
mineral
Limonite
Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)
mineral
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Fluorite (Green)
Calcium Fluoride (CaF2)
mineral
Calcite
Calcite (CaCO3)
Mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral